Expansion joint, method and apparatus for the installation of the same



April 11, 1933. C QLDER ,93,608 EXPANSION JOINT, METHOD AND APPARATUSFOR THE INSTALLATION OE THE SAME Filed Aug. 7, 1931 3 sheets-sheet 1April 11, 1933. c. OLDE 1,903,608 EXPANSION JOINT, METHOD AND APPARATUSFOR THE INSTALLATION OF THE SAME Filed Aug. '7, 1931 5 Sheets-Sheet 220M 0 il] 22 i Ufff/5f f dffffdldef WMQQMJWI/S April 11,` 1933. Q OLDERI 1,903,668

EXPANSION JOINT, METHOD AND APPARATUS FOR THE INSTALLATION OF THE SAMEFiled Aug. 7, 1931 3 Sheets-Sheet 3 xjgl.

4@ 75H @ifa wfg/ 20 Patented Apr. 11, 1933 UNITED STATES` PATENT OFFICECLIFFORD OLDER, F WIIAMETTE, ILLINOIS EXPANSION JOINT, IIETHOD A NDAPPARATUS FOR THE INSTALLATION OF THE SAME Application led August 7,1.931. Serial No. 555,726.

concrete roads and the like.

The concrete pavements of the prior art are ordinarily constructed in aplurality of sections with cracks between the sections and withsubstantially larger expansion cracks located at regular intervals forthe purpose of permitting the longitudinal expansion of the pavementunder changes of temperature of the pavement. Expansion joints of thistype may be installed to permit initial expansion or contractiondepending upon the result desired.

When the separate sections of the pavement expand, there is a gradualsliding of the sections toward the expansion crack or 0 joint, but whenthe sections subsequently yso contract, they do not tend to return totheir former position. This results in the disappearance of therelatively wide expansion` crack, and the space utilized by the wideexpansion crack is soon divided into a plurality of cracks formedbetween adjacent sections of the pavement and it is practicallyimpossible to prevent this action of the pavement sections in closing upthe expansion joints.

The open expansion joints and cracks between adjacent sections soonbecome filled with dust, soil'and sand particles and as this material isgenerally incompressible it follows that when expansion again takesplace, the joints cannot close between the adjacent sections and thewhole series of sections-is pushed still further toward the expansionjoint, until eventually all of the joints, including the expansionjoint, have become filled with hard packed unyielding material. Thepurpose of the expansion joint is then defeated and further expansion ofthe concrete sets up compression stresses as great as there would be inoase no expansion joint had been provided in the lirst place.

Another diliculty encountered in providing expansion joints lies in thefact that the continuous expansion and contraction of the concretepermits the sand, `soil and other material to get in between thesections of concrete and the folds of the expansible metal joint. As thespace between the concrete sections around the expansible metal becomesfilled with hard packed material, the expansible, fold itself becomescompressed between the sections of concrete and hard packed material inthe crack with the result that the easy curve, preferably providedbetween the folds of the expansible joint, becomes pressed to a sharpedge, thereby causing the expansible metal strip .to crack along thesharp edge between the sections of concrete. Unless provision is madefor taking care of this tendency the fold in the expansible metal stripultimately takes the form of a sharp bend, the metal then becomespinched or creased and cracked and the purpose of the expansible jointis defeated.

One of the objects of the present invention is the elimination of theforegoing dihculties by the provision of an improved expansion joint ofrelatively simple and economical construction which is adapted to permitrelative movement between adjacent sections of the pavement and toprevent the filling of the cracks between the sections with dirt orother foreign material. Another object of the invention is the provisinof a plurality of improved and simpliied forms of 'expansion jointsadapted to positively prevent the formation of a sharp bend, fold orcrease, and to prevent the pinching of the sheet metal ofy the joint bythe foreign material filling the crack, so that the expansible metaljoint will not be cracked or broken after a long period of service.

Another object of the invention is the provision of a plurality of formsof metal expansion joints for pavement, or the like,

which are not only adapted to secure the ad- -v minimum amount of laborafter the concrete has been levelled off.

Another object of the invention is the provision of an improved templatepeculiarly adapted to install the expansion joints disclosed herein at apre-determined height with respect to the'top of the concrete. Otherobjects and advantages of the invention will be apparent from thefollowing description and rom the accompanying drawings, in whichsimilar characters of reference indicate similar parts throughout theseveral views.

Referring to the drawings, of are three sheets;

Fig. 1 is a vertical sectional view of a portion of a concrete pavement,floor, sidewalk or the like, which is equipped with an expansion jointof the simplest type constructed according to the present invention;

Fig. 2 is a similar sectional view of the eX pansion joint just after ithas been installed in the green concrete, showing one form ofconstruction of the template.

Fig. 3 is a similar view showing another form of construction of thetemplate.

- Fig. 4 is a similar sectional view of another form of template.

Figure 5 is a. transverse sectional view of the concrete pavement at theexpansion oint showing a side elevation of the template and metalexpansion strip.

Fig. 6 is a view similar to Fig. 1 of an* other form of expansion jointjust after the edges of the concrete sections have been finished olf atthe surface.

Fig. 7 is a similar view of the same joint after the cap has beenremoved and the joint filled with a suitable plastic filler. l

Fig. 8 is a similar view of another form of expansion joint peculiarlyadapted to prevent the formation of a sharp crease at the fold betweenthe parts of the metal strip.

Fig. 9 is a similar view of another improved expansion joint having adifferent form of division plate. i

Fig. 10 is a similar view of another form of expansion joint providedwith means of preventing the concrete fillingthe space between the foldsof the expansion strip.

Fig. l1 is another similar sectional view of a modification.

Fig. 12 is a similar view of another modifiL cation.

Fig. 13 is a similar view of a modified form of installation having anexpansion strip at the top and bottom and Fig. 14 is a similar view ofanother modification.l

Referring to Fig. 1, the numerals 2d and which there `21 indicate theadjacent concrete sections of the pavement ywhich are separated by thecrack 22, which is formed as the natural result of the contraction ofthe concrete as the concrete dries or contracts. The forml of eX-pansion strip shown in Fig. 1 is indicated in its entirety by thenumeral 23 and it preferably consists of an eXpansible member or stripof non-corrodable sheet metal such as brass, bronze or the like, ifdesired. Ordi nary sheet steel may also be employed. The expansion strip23 preferably includes a centrally located expansible portion comprisinga downwardly extending V-shaped part formed by the flanges 24 and 25,and the downwardly extending side flanges 26 and 27.

The bends at 28, 29 and 30, between the flanges 24-27 inclusive arepreferably easy bends, being slightly rounded to prevent the breaking ofthe metal or creasing of the metal at these points and the flanges 24-27are adapted to flex resiliently to permit move ment between the adjacentsections 20-21 of concrete.

The expansible portion of the present strip is, therefore, substantiallyM-shaped in cross section and the downwardly extending flanges 26 and 27are provided with laterally projecting parts 30, 31 and 32 extendinginto the concrete 20 and 21. The laterally projecting flanges 31 and 32are preferably bent downward as at 33 to provide an anchoring formationin the concrete or they may be provided with backwardly bent flanges 34,which provide a support for a downwardly extending integral sheet metaldivision plate 35.

The division plate 35 extends sufficiently into the concrete body sothat the concrete is weakened at 22 between the sections 2O and 2l andthe crack 22 naturally results.

Between the flanges 32 and 34 the expan sion strip is preferably formedwith an enlarged bead 36, which also provides an anchoring formation forthis side of the expansion strip in the concrete section 2l. The4 stripis preferably installed between sections 2O and 21, substantially belowthe surface of the concrete, leaving spaces 37 and 38 at each sidebetween the flanges 26, 27 and the adjacent concrete. These spaces arepreferably filled with plastic filler 39, such as some asphaltumcompound, adapted to fill these spaces and prevent dirt from getting inbetween the sections of concrete. The adj accnt corners 40 and 41 of theconcrete sections 2O and 21 are preferably rounded off and when theexpansion is so installed it is adapted to permit relative movementbetween the concrete sections 2O and 21 without permitting the dirt orforeign material to enter the crack 22. f

It should be noted that between the flanges 24, 26 and 25-27, there areopen spaces 42-43, and that as the concrete section 21 spreads fromsection 20 the V-shaped portion 24, 25, 30 tends to lift up from theadjacent concrete. This lifting tendency of the expansion strip tends topermit the plastic filler l 39 to spread out to cover the space betweenthe concrete sections 20, 21 more effectively. Referring to Fig. 2, thisis an illustration of the same type of expansion joint with improvedtemplate adapted to be used to install these expansion strips. Thetemplate is indicated in its entirety by the numeral 44, and it'preferably consists of a long strip of lumber or metal havingsufficient flexibility to adapt itself to the natural crown of thepavement without being so flexible as to permit it to sag.

The template body 45 is preferably provided with plow handles 46 at eachend to permit the handling of the template. In some embodiments of theinvention the tem'- plate may be supported by stirrups and cables insuch manner that it may be made more flexible, since it can be supportedat its half and quarter points. The template is preferably as long asthe expansion strip intended to be installed, or as long as the width ofthe strip of concrete in which the expansion joint is being installed.The surface of the concrete is preferablyvfinished to final form priorto the installation of the joints and the template ,should therefore besufficiently flexible in alengthwise drection so that when the flatsurface 47 rests on the concrete, the template will conform to theactual crown of the concrete, rather than to the theoretical curve. Itis generally impossible to obtain exactly the theoretical curve desiredand by having the template adjust itself to the actual curve of theconcrete the. expansion strip will be located at a proper elevationrelative to the actual concrete surface.

The template is preferably provided with a plurality of transverselyextending vertical bores 48, adapted to serve as guides for the securingrods 49. Each of the securing rods 49 extends through bores 48 and isprovided with a bent end or handle 50 at the top as well as a bent end51 at the bottom for engaging the expansion strip 23. Each of the rods49 is urged upward by-helical s ring 52, which engages the upper surfaceo the template body and also engages washer 53 below the handle 50. Thespring 52 tends to pull the rod 49 upward to maintain it in engagementwith the expansion strip 23. Y

The lower bent end 51 is preferably provided with a notch 54 forengaging the edge of the flange 35. The body of the template may beprovided witha groove 55 for rece1ving a channeled metal member 56,which-1s secured in-the groove by a plurality of screws 57. Thechanneled metal member 56 has, 'a pair of downwardly extending flanges58 and 59, spaced apart sulllciently to receive the cap strip 60.. Thecap strip 60 may consist of a channeled metal member having downwardlyextending parallel flanges 61 and 62, spaced sufficiently so as toreceive the expansion strip 23 between them. The ends of thev flanges 61and 62 engage the laterally extending flanges 31 and 32 of theexpansionstrip 23, and the expansionstrip may be secured to 'the template 44 bypushing the rods 49 downward and rotating them until the grooves 54register with division strip 35. Upon releas.

ing the handle 50, the rod 49 will be forced into engagement with theedge of division strip 35 by the spring 52 and the expansion strip 23will be clamped between the channeled cap member 60 and the bent ends 5lof the rods 49. The template and expansion strip may then be lifted asan'entirety by means of the plow handle 46 and the template with theexpansion strip may be placed on top of the green concrete. The weightof the template, together with tapping or pressure exerted on thetemplate will cause the expansion strip to be embedded into the concreteas shown in F ig. 2 and the expansion strip will be located at apredetermined depth below the surface ofthe concrete by reason of thefact that the flexible template conforms to the crown of the concretewhen the surface 47 engages the top of the concrete. The rods 49 maythen be pushed downward and rotated to release the division strip 35 andupon lifting the template the channeled member 56 will leave the capstrip 60 and expansion strip 23 embedded in the concrete.

The cap strip 60.may then be used as a guide in employing edging toolsto finish the adjacent edges 40 and 41 of the concrete sections 2() and21, after which the cap strip 60 may also be removed and used over againfor subsequent joints.

Referring to Fig. 3, this is a modified form of template in which thetemplate body 45 has been made thinner and more flexible and the bodyhas been provided with metal guides 63 for the rods 64 and 65. The capstrip 60 has been permanently secured to the automobile body 45 in thismodification and is adapted to be remov'ed with the template. The rod 64for holding the expansion strip 23 may be of substantially the sameconstruction as the rod 49 previously described, except for theprovision of vthe metal guide 63. The rod 65 may also be of the sameconstruction except that it is shorter and is provided with a groove 66for engaging the downwardly bent flange 33 on the other side of theexpansion strip 23. In this modification the template is adapted to holdthe ex fied form of template, having a flexible metal body 67, providedwith a simple cap strip 60, having downwardly extending flanges 61 and62. The template body 67 carries a channel 68, one flange of which issecured to the body 67 and the other flange of which carries a metallplate 69. The metal plate 69 and the templa-tebody 67 are provided with4bores 70 and 71 adapted Ito act as guides for l sections 20 and 21.

the rods 49. The rods 49 in every one of the templates are preferablylocated at-each end Lof the template and at regularly spaced pointslongitudinally of the template.

Fig. 5 is an elevational view showing the side elevation of the templateas it extends across the pavement conforming to the actual crown of theconcrete.

Referring to Fig. 6, this is a similar view of an expansion joint ofsimple shape except that the flanges 26 and 27 of the expansion strip 23are joined by a semi-circular curved portion 72 making an expansibleportion of a substantially inverted U-shape. The expansion joint isillustrated with the cap strip in place, just after the corners 4.0 and4:1 have been rounded off with edging tools. The same form of expansionstrip` is shown in Fi ure 7 after the joint has been completed and t espace around expansion strip 23 has been covered with a plastic filler39. The expansion joint shown in Fi 7, however, has its flange 34shorter than anger 32, so that the concrete may extend across at 73below the space 7 4, which may be filled with yielding material 75, suchas sponge rubber, plastic asphalt, corrugated paper, etc. The concreteat 73 is thus adapted to prevent the falling out or escaping of thefiller 75 into the crack 22 when the sections 2O and 21 contract, asshown in Fig. 7. In Fig. 6 the space 74 is left vacant in order that theflexible part 26, 27 and 72 of the expansion strip 23 may move downwardas the concrete contracts and pulls the flanges 26 and 27 apart.

Referring to Fig. 8, this is a modified form of expansion joint, with animproved form of expansion strip 23, shown with the cap strip in placeas in Fig. 6. The expansion strip 23 of this figure is provided with asubstantially circular bead 76, the edges of which are attached to theparallel flanges 77 and 78, which extend downwardly from the bead 76 incontact engagement with each other. The flanges 77 and 78 are adapted toresiliently engage and hold a division plate 79, which may consist oaplane strip of sheet metal and the division strip 79 is thus locatedimmediately below the expansible portion 76 of the expansion strip 73.

The flanges 77 and 78 are bent laterally at 79 and 80, forming theflanges 81 and 82, which extend into the body of the concrete The edges'of flanges 81 and 82 are preferably bent downward or upward to provideanchoring formations 83 in the concrete and `tongues 84 may be bentupward out of the body of flanges 81 and 82 for engaging the sides 'ofthe cap strip 60. The diameter of the circular bead 76 should preferablybe such that the circular partr 7 8 engages the inside of the cap strip60* and the present expansion strip 23 may thus bev installed by thesame form of template, provided the rods are made sufficiently short toengage the edges 83.

Referring to Fig. 9, this is another modification comprising expansionstrip 23 of the same form shown in Fig. 8 except that the division plate35 is of the form illustrated in Fig. 1. The circular bead 76 in both ofthese modifications is adapted to effectively prevent the formation of asharp crease at the upper edge of the expansible strip 23 even after thespace around the strip has been filled with relatively hard andincompressible material. r[he dirt or other incom ressible material mayengage the flanges 7 and 78 as'the concrete sections expand against theexpansible metal strip without damaging the strip.

Referring to Fig. 10, this is another modified form of strip, theanchoring formation and division plate of which are similar to thoseshown in Fig. 1. rlhe expansible part consists of the inverted U-shapedportion formed by the flanges 26 and 27 and the curve 72, similar toFig. 6. In this embodiment, however, provision has been made to fill thecurved portion 72 of the expansion strip 23 by providing a metal wire85, which is carried by the curled edge 86 of a filler strip 87. Thecurved upper portion of the expansion strip 23 being filled by the wire85 and bead 86, it is practically impossible for the curved portion 72to be forced into a sharp crease, and the present type of expansionjoint is adapted to be opened and closed over long periods of timewithout the possibility of the joint being damaged by dirt or otherincompressible material which might gather around the joint. The fillerstrip 87 preferably extends diagonally across the space 88 between theflanges 26 and 27, and is formed with a transversely extending flange89, which is slidably received between the flanges 32 and 34. Thetransverse flange 89 closes the lower opening of the space 88, andprevents the concrete from entering the space 88 as the expansion stripis pressed into place in the green concrete.

Referring to Fig. 11, this is a modified expansion joint with expansionstrip 23 of substantially the same form as that shown in Fig. 8, but thecircular bead 76 has been filled with a coiled sheet metal member 90.The division plate 79 is carried in the same manner as shown in Fig. 8,and the division plate 79 prevents the coiled filler 90 from falling outof the bead 76 as the opening at the crack 22 increases.

Referring to Fig. 12, this is a modified form of the same expansionstrip in which th'e circular bead 76 has been filled with a Wire 90, thewire being carried by the curled edge 91 of a filler plate 92, in ordertoinsure the maintenance of the filler plate in proper form. It isprovided with a laterally extending flange 93, located between theflanges kform described with respect to Fig. 8, but

they are preferably lled with wires 94 at the beads 76, to insure themaintenance of these beads in circular form. The division plate 95 ispreferably formed with a laterally extending trough 96, so as to providethe section of concrete with a lug 97, slidably engaging the trough 96in section 21 to maintain the alignment of the concrete sections.

It will thus be observed that the present expansion joints may beutilized with a number of different forms of division plates, and bothsurfaces of the concrete may be protected, if desired. v

Referring to Fig. 14, this is a modified form utilizing a similar typeof expansion strip 23, but the division plate 98 is provided with acurled upper edge 99, curled about a wire 100. The wire and curled edge99 and 100.v Being located in' the bead 76, there is no possibility ofthe wire dropping and the division plate 98 is also positively held inproper position. It will thus be observed that I have invented aplurality of improved forms of expansion joints, expansion strips anddivision plates -which are capable of permitting movement betweenadjacent sections of concrete. My expansion strips have their expansibleportions so formed and arranged that it is practically impossible forthe adjacent sections of concrete to crush the expansion strip and forma crease. The tendency toward creasing or cracking has thus beeneliminated, and one of the most important defects of the expansionstrips of the prior art is hereby eliminated. y

The present apparatus for installing these expansion strips is adaptedto permit their installation with a minimum amount of labor and at apredetermined height with respect to the surface of the concrete, sothat it is unnecessary to fasten the expansion strips or division platesto the ground prior to the installation of the concrete. This leavesspace open for the installation of the concrete and for the operation ofconcrete machinery without interfering with the previously installeddivision plates or the like and greatly expedites the installation ofthe pavement.

While I have illustrated and described a preferred embodiment of myinvention,

many modifications may be made without departing fromthe spirit of theinvention,l

sire to avail myself of all changes within the scope of the appendedclaims.

Having thus described my invention, what I claim is new and desire tosecure by Letters Patent of the United States is:

l. A template for installing expansion strips comprising the combinationof a iexible body adapted to conform to the surface of the concretepavement, with means for engaging an expansion strip in predeterminedvposition with respect to said template, and detachable fasteningdevices for releasably holding said expansion strip and said templatewhereby said expansion strip may be released from said'template after ithas been located in the concrete by means of said tem=` plate.

2. A template for installing expansion strips, comprising thecombination of a iiexible body adapted to conform to the surface of theconcrete pavement, with means for engaging an expansion strip in-predetermined position with respect to said template,

detachable fastening devices for releasably holding said expansion stripand said template whereby said expansion strip may be released from saidtem late after it has been located in the concrete y means of saidtemplate, and a substantially flat auge surface on said template forengaging t e upper surface of the concrete and determining the finalposition of said expansion strip with respect to the surface of theconcrete.

3. A template for installing expansion wstrips comprising thecombination of a. flexible body adapted to conform to the surface of theconcrete pavement, with means for holding an expansion strip inpredetermined position with respect'to said template, comprising aplurality of spring pressed plungers adapted to be rotated intoengagement with said expansion strip to hold the strip on said template.

4. A template for installing A expansion strips comprising an elongatediexible strip with a lower flat'gauge surface, adapted to conformsubstantially to the crown of the concrete pavement, a channeled metalmember carried by said gauge surface and adapted to telescopicallyreceive an expansion strip and means for detachably holding saidexpansion strip in said channeled member.

5. A template for installing expansion strips comprising an elongatedexible strip with a lower fiat gauge surface, adapted to conformsubstantially to the crown of the concrete pavement, a channeled metalmember carried by said gauge surface and adapted to telescopicallyreceive an expansion strip and means for detachably holding saidexpansion strip in said channeled member, comprising a plurality ofspring pressed plungers carried by said body, said plungers havinglaterally extending ends for engaging below said expansion strip andhaving springs for urging said plungers into engagement with saidexpansion strip.

6. A template for installing expansion strips comprising an elongatedflexible body with a lower flat gauge surface, adapted-to conformsubstantially to the crown of the concrete pavement, a channeled metalmember carried by said gauge surface and adapted to telescopicallyreceive an expansion strip, means for detachably holding said expansionstrip in said channeled member, comprising a plurality of spring pressedplungers carried by said body of said plungers having laterallyextending ends for engaging below said extension strip and havingsprings for urging said plungers into engagement with said expansionstrip and a plurality of handles carried by said template.

7. In a device for installing metal expansion joints the combination ofa channeled metal member with a flat flexible supporting body, anexpansion strip having an expansiblo portion adapted to be received insaid channeled member, having downwardly extending flanges and aplurality of plungers adapted to resiliently engage said downwardlyextending flanges and retain said expansion strip in said channeledmember.

8. In an expansion joint, the combination of a pair of concrete sectionslocated adjacent each other, with a metal expansion strip having a pairof anchoring formations embedded in said concrete sections, upwardlyextending flanges carried by said anchoring portions and located in anopen space between said sections, and a pair of downwardly extendingdiagonal flanges joined together to form an expansible portion, oneofsaid anchoring portions comprising a substantially circular bead andan integral division plate carried by said bead and extending downwardbetween said concrete sections to form a crack at a predetermined oint.

9. An expansion joint the combination of a channeled cap strip, having apair of parallel, downwardly extending flanges with an ex ansion striphaving a substantially circu ar bead, located inside said channeled capstrip, said expansion strip having a pair of downwardly extendingadjacent flanges, each joined to laterally extending flanges, havinganchoring flanges embeddedin the concrete.

l0. In an expansion joint the combination of a channeled cap strip,having a pair of parallel, downwardly extending flanges, with anexpansion strip having a substantially circular bead, located insidesaid channeled cap strip, said expansion strip having a pair ofdownwardly extending adjacent flanges, each joined to laterallyextending flanges, having anchoring flanges embedded in the concrete,and a division strip slidably mounted between said downwardly extendingflanges and resiliently gripped thereby for forming a crack betweensections of concrete at said expansion strip.

11. An expansion joint the combination of a channeled cap strip, havinga pair of parallel, downwardly extending flanges with an expansion striphaving a substantially circular bead, located in said channeled capstrip, said expansion strip having a pair of downwardly extendingadjacent flanges, each joined to laterally extending flanges, havinganchoring flanges embedded in the concrete, and an integral downwardlyextending division plate carried by said expansion strip.

l2. An expansion joint the combination of a channeled cap strip, havinga pair of parallel, downwardly extending flanges with an expansion striphaving a substantially circular bead, located in said channeled capstrip, said expansion strip having a pair of downwardly extendingadjacent flanges, each joined to laterally extending flanges, havinganchoring flanges embedded in the concrete, and an integral downwardlyextending division plate carried by said expansion strip, said divisionplate being offset from the axis of said expansion member, to cause theconcrete to close the opening below the said expansion member.

13. An expansion strip comprising a resilient sheet metal member formedwith a pair of laterally extending flanges, each having anchoringformations for securement in adjacent sections of concrete, a pair ofupwardly extending resilient flanges jointed by a substantiallycylindrical curved portion and a filler of circular form adapted toprevent the crushing of said cylindrical portion of said expansiblemember to prevent the cracking of said expansible member.

14. An expansion strip comprising a resilient sheet metal member formedwith a pair of laterally extending flanges, each having anchoringformations for securement in kadjacent sections of concrete, a pair ofupwardly extending resilient flanges joined by a substantiallycylindrical curved portion and a filler of circular form adapted to pre-Lvent the crushing of said cylindrical portion of said expansible memberto prevent the cracking of said expansible member, said fillercomprising a sheet metal member having its edge curled ,about a wire,and said sheet metal member having a laterally extending flange forpreventing entrance of concrete between said upwardly extending flanges.

l5. Anexpansion strip comprising a resilient sheet metal member formedwith a pair of laterally extending flanges, each having anchoringformations for securement in adjacent sections of concrete, a pair ofupwardly extendingresilient flanges jointed by a substantiallycylindrical curved portion and a filler of circular form adapted toprevent the crushing of said cylindrical porvtion of said expansiblemember to prevent the cracking of said expansible member, said fillerhaving a divison plate having its edge curled about a wire and said wirebeing l0- cated in said cylindrical portion of said expansible member.

16. In an expansion joint for concrete pavements or the like, thecombination of a pair of concrete sections located adjacent each other,with a metal expansion strip, said metal expansion strip having anextensible medial portion, downwardly extending flanges on each side ofsaid medial portion,

a laterally projecting flange having an anchoring formation forsecurement in one of said concrete sections, a laterally projectingflange formed with a bead for securement in the other of said concretesections, and a downwardly extending dividing strip adapted to form acrack in the pavement below said expansion joint.

In witness whereof, I hereunto subscribe my name this 24th day of July,1931.

CLIFFORD OLDER.

